a = 1
b = 2
c = 3
d = 4
e = 5
f = 6
g = 7
h = 8
i = 9
j = 10
k = 11
l = 12
m = 13
n = 14
o = 15
---
tail1:
a = 1
b = 2
c = 3
d = 4
e = 5
f = 6
g = 7
h = 8
i = 9
j = 10
k = 11
l = 12
m = 13
n = 14
o = 15
---
tail2:
a = 0
b = 1
c = 0
d = 1
e = 0
f = 1
g = 0
h = 1
i = 0
j = 1
k = 0
l = 1
m = 0
n = 1
o = 0
---
tail3:
o = 15
---
external:
a = 1
b = 2
c = 3
d = 4
e = 5
f = 6
g = 7
h = 8
i = 9
j = 10
k = 11